<template>
  <div>
    <!-- Header 区域 -->
    <van-nav-bar
      fixed
      title="文章详情"
      left-arrow
      @click-left="$router.back()"
    />

    <!-- 网络慢的时候提示加载中 -->
    <van-loading
    class="loading" color="#1989fa" size="30"
    v-if="Object.keys(artObj).length === 0" >
    玩命加载中......
    </van-loading>
    <div v-else>
      <!-- 文章信息区域 -->
      <div class="article-container">
        <!-- 文章标题 -->
        <h1 class="art-title">{{ artObj.title }}</h1>

        <!-- 用户信息 -->
        <van-cell
          center
          :title="artObj.aut_name"
          :label="formatDate(artObj.pubdate)"
        >
          <template #icon>
            <img :src="artObj.aut_photo" alt="" class="avatar" />
          </template>
          <template #default>
            <div>
              <van-button
                v-if="artObj.is_followed === true"
                type="info"
                size="mini"
                @click="followFn(true)"
                >已关注</van-button
              >
              <van-button
                v-else
                icon="plus"
                type="info"
                size="mini"
                plain
                @click="followFn(false)"
                >关注</van-button
              >
            </div>
          </template>
        </van-cell>

        <!-- 分割线 -->
        <van-divider></van-divider>

        <!-- 文章内容 -->
        <div class="art-content" v-html="artObj.content"></div>

        <!-- 分割线 -->
        <van-divider>End</van-divider>

        <!-- 点赞 -->
        <div class="like-box">
          <van-button
            v-if="artObj.attitude === 1"
            icon="good-job"
            type="danger"
            size="small"
            @click="likeFn(true)"
            >已点赞</van-button
          >
          <van-button
            v-else
            icon="good-job-o"
            type="danger"
            plain
            size="small"
            @click="likeFn(false)"
            >点赞</van-button
          >
        </div>
      </div>

      <!-- 文章评论区域 -->
      <div>
        <CommentList></CommentList>
      </div>
    </div>
  </div>
</template>

<script>
import {
  detailAPI,
  userFollowedAPI,
  userUnFollowedAPI,
  userLikeAPI,
  userUnlikeAPI
} from '@/api'
import { timeAgo } from '@/utils/data.js'
import CommentList from './CommentList.vue'
export default {
  name: 'Detail',
  components: {
    CommentList
  },
  data () {
    return {
      artObj: {}
    }
  },
  // 获取文章详情
  async created () {
    const res = await detailAPI({
      artId: this.$route.query.art_id
    })
    this.artObj = res.data.data
  },
  methods: {
    formatDate: timeAgo,
    // 关注/ 取关
    // 注意： 每个登入的手机号，都维护这自己的关注列表
    // 强烈建议：用另一个手机号登入
    async followFn (bool) {
      if (bool === true) {
        // 用户点在'已关注'上
        // 业务：取关
        // 掉接口 -> 取关接口
        this.artObj.is_followed = false
        await userUnFollowedAPI({ userId: this.artObj.aut_id })
      } else {
        // 点击关注
        // 掉接口 关注接口
        this.artObj.is_followed = true
        await userFollowedAPI({ userId: this.artObj.aut_id })
      }
    },
    async likeFn (bool) {
      // 用户点击了已点赞
      // 业务：取消点赞
      // 显示点赞按钮
      if (bool) {
        this.artObj.attitude = 0
        await userUnlikeAPI({ userId: this.artObj.art_id })
      } else {
        // 点击点赞
        // 显示已点赞
        this.artObj.attitude = 1
        await userLikeAPI({ userId: this.artObj.art_id })
      }
    }
  }
}
</script>

<style scoped lang="less">
.article-container {
  padding: 10px;
  margin-top: 46px;
}
.art-title {
  font-size: 16px;
  font-weight: bold;
  margin: 10px 0;
}

.art-content {
  font-size: 12px;
  line-height: 24px;
  width: 100%;
  overflow-x: scroll;
  word-break: break-all;
  /deep/ img {
    width: 100%;
  }
  /deep/ pre {
    white-space: pre-wrap;
    word-wrap: break-word;
  }
}

.van-cell {
  padding: 5px 0;
  &::after {
    display: none;
  }
}

.avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: #f8f8f8;
  margin-right: 5px;
  border: none;
}

.like-box {
  display: flex;
  justify-content: center;
}
.loading {
  margin-top: 50px;
  text-align: center;
}
</style>
